PJB-2024-572
Altitudinal Effects on Osmotic Regulation and Plasma Membrane Permeability of Lonicera caerulea Leaves on the Northern Slope of Changbai Mountain, China
Qige Qi
Abstract
Lonicera caerulea is a perennial deciduous shrub of medical and edible value that is widely distributed on the northern slope of Changbai Mountain. Soil properties and climate parameters at different elevations affect plant growth, but thus far no studies have been conducted on L. caerulea in different elevation gradients on the northern slope of Changbai Mountain. Here, the leaves of L. caerulea, collected from different elevations (800–1800 m) on the northern slope of Changbai Mountain in China, were used as test materials. The aim was to determine the changes in the leaves’ soluble protein content, soluble sugar content, malondialdehyde (MDA) content, superoxide anion content, and plasma membrane permeability along the altitudinal gradient. The leaf-level data were statistically analyzed with respect to various environmental factors (soil properties and climate parameters) to explore the physiological and biochemical mechanisms of their adaptation to mountainous habitats. The soluble protein and soluble sugar contents initially increased and then decreased with greater altitude; The MDA content increased at first, then decreased, and then increased with altitude; The superoxide anion content initially decreased and then increased with greater elevation. The leaves’plasma membrane permeability initially decreased and then increased with greater elevation. Plasma membrane permeability was mainly affected by the total K content. For plants established at differing elevations, the leaf traits appear able to correspondingly adapt to the local habitat. In general, the growth of L. lonicera at low and high altitude areas on the northern slope of Changbai Mountain is easily restricted by various environmental factors, resulting in its poor growth condition there. By contrast, this shrub grows well at mid-elevations; thus, the planting area of L. caerulea should be expanded to those areas to increase this shrub’s fruit yield and quality.
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